Venugopalaravu, Pemmaraju. <br/><br/>
Textbook of environmental engineering / 
 Environmental engineering 
P. Venugopala Rao. 
 - New Delhi :  Prentice Hall of India,  2002. 
 - xii, 268 p. :  ill. ;  23 cm. 
<br/><br/>Bibliography : p. 263. 
<br/><br/><label>ISBN: </label>8120319303 (pbk). 9788120319301 (pbk). 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental engineering.<br/>Environmental health.<br/>Sanitary engineering.<br/>Sanitation.